How to determine the different dominant frequency components in the signals

I have a signal of dimension 400 x 1... This is a time varying signal with timesteps of 7 microseconds.

How to determine the different dominant frequency components in the signals (either for the whole signal duration, or for specific periods)." What are the dominant frequencies?

Answer 1

[Adam]

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[Adam]

Well, it depends how "dominant frequencies" are defined. You can get the dominant frequency just by taking the max of the spectrum, but if it is a complicated spectrum it may be multimodal and just the max may not give a very accurate representation so you would need to find multiple peaks or do a thresholding on the spectrum to find frequencies above a certain power